PREFACE TO THE SECOND EDITION xxxix 



and I now suspect it is my scant and quite insufficient 

 treatment of the peculiar nature of Space, as involved 

 in my general doctrine, that is responsible for this 

 frequent failure of readers to catch the objective char- 

 acter of the theory. In the system of Personal Ideal- 

 ism, of course. Space is the principle a priori whtvoby 

 each conscious self that has the phase of intelligent 

 being which we call experience, comes into actual 

 sensuous commerce with other selves of that species, 

 or, in short, shares with them in a real located and 

 physical world. As such, it is discriminated from 

 Time, the principle a priori that coordinates the pri- 

 vate experiences of each self into a succession possi- 

 bly necessary and predictable. Its nature, as thus a 

 public principle in contrast to a private one, is in fact 

 founded in the twofold aspect, self-referring and 

 other-referring, essential to any individual self-con- 

 sciousness ; and the development of this doctrine of 

 the origin of the space-consciousness, clearing up, as 

 it would, the puzzle left over by Kant, — whether and 

 why there are two elemental Sense-Forms, and no 

 more, — would of course form a very important part 

 of the systematic discussion of the new theory. In 

 the first edition, however, the doctrine was merely 

 referred to in passing ; ^ and even in the present edi- 

 tion I must content myself with barely touching upon 

 it as I have now done, and directing the reader's 



^ See pp. xiii and xxii, and cf. p. 352, note, and p. 353. 



